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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19cc08153c200629ec1b2ff024137139b634784142937ebf028089c9343f771' 
  AND token = 'GnJTNZqY+sjw/O4TnBsid4DEiwT2IfLkzGrZo9c7xpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}